An administrator is configuring an Ipsec between site A and siteB. The Remotes Gateway setting in both sites has been configured as Static IP…

In a site-to-site IPsec VPN configuration, the Phase 2 selectors (Quick Mode Selectors) must be a mirror image of each other on the peer gateways. Site A defines its local network (192.168.1.0/24) as the local selector and Site B's network (192.168.2.0/24) as the remote selector. Consequently, Site B must configure its local selector to be its own network (192.168.2.0/24) and its remote selector to be Site A's network (192.168.1.0/24). This ensures that both ends of the tunnel agree on which traffic is to be encrypted.

A. 192.168.3.0/24 is an unrelated subnet and would cause a Phase 2 negotiation mismatch and failure.

C. 192.168.1.0/24 is Site A's local network, so it must be configured as the remote selector on Site B, not the local one.

D. 192.168.0.0/8 is a supernet that does not match the specific remote selector configured on Site A, leading to a mismatch.

1. FortiOS 7.0.0 IPsec VPN Administration Guide, "Phase 2 configuration," Page 71: "The settings must be the same on both peers, except for Source Address and Destination Address, which must be mirrors of each other."

2. FortiOS 7.0.0 IPsec VPN Administration Guide, "Quick mode selectors," Page 29: "The quick mode selectors determine which traffic is to be encrypted and protected by IPsec... The local and remote selectors on the local FortiGate must be mirrored on the remote FortiGate."